Foldable trolley

Abstract

The present invention relates to a foldable trolley having a trolley frame and a flexible fabric bag or the like. The invention is characterized by its unique design that includes a light weight structure, a large supported space and can be conveniently folded and unfolded. The trolley can alternatively be folded into a flat structure to save storage space or put into a car trunk for shopping or for the temporary transporting of goods. In this structure, both sides of the handhold U frame are directly hinged to the lower frame. The motive force can be directly transmitted to the lower frame. The overall shape appeals to the public aesthetic sense; and moreover, the hinge point between the handhold U frame and lower frame is the center for unfolding and folding, and thus has a smoother operation.

We claim: 
     
       1. A foldable trolley comprising:
 A trolley frame and flexible fabric: wherein the trolley frame comprises a lower frame, an upper U frame, a front U frame, a handhold U frame, a support U frame, front rollers and back rollers; 
 the back rollers are installed at a back section of the lower frame, 
 the front rollers are installed at a front section of the support U frame, 
 the flexible fabric is a bag structure having upper edges and lower edges and an open end for receiving and holding material in said bag structure, 
 the lower edges of the bag structure are connected to the lower frame; 
 said handhold U frame having a middle portion and two side portions; 
 said lower frame having a front section, a back section, and two side portions, said back section having a middle portion located between the two side portions; 
 said upper U frame having a back portion and side portions; 
 said front U frame having a pair of arms on either side of a transversal bar; 
 said support U frame having a pair of arms; 
 wherein both side portions of the handhold U frame are respectively hinged to both side portions of the lower frame back section, 
 the middle portion of the handhold U frame is hinged to both side portions of the upper frame back portion; 
 each of the front U frame pair of arms respectively hingedly connected to a respective one of said pair of arms of said support U frame, 
 each of said pair of arm of the front U frame are respectively hinged to a one of said side portions of the lower frame in a central part of said lower frame, and each of said pair of arms of the support U frame are hinged to a respective one of side portions at a front part of the upper U frame; and 
 wherein the foldable trolley can be unfolded and folded about each hinge; and the upper edges of the bag structure are fixed to the upper U frame and to the transversal bar of the the front U frame. 
 
     
     
       2. The foldable trolley of  claim 1 , futher characterized in that each side portion of the upper U frame side portions is respectively hinged to one of the side portions of said two side portions of the lower frame at a middle part of the lower frame by a connecting bar, wherein said connecting bar forms a 4-bar connecting mechanism with parts of said lower frame, said upper U frame and said handhold U frame. 
     
     
       3. The foldable trolley of  claim 1 , wherein the front U frame and the support U frame are connected by a pair of connecting pieces,
 each of the said pair of connecting pieces including two hinged connecting pieces and a handle at a top of one connecting piece. 
 
     
     
       4. The foldable trolley mentioned in  claim 3  wherein one end of the support U frame includes a buckle by which the handhold U frame can be buckled to the trolley frame when the trolley frame is in a folded configuration. 
     
     
       5. The foldable trolley mentioned in  claim 1 , wherein one end of the support U frame includes a buckle by which the handhold U frame can be buckled to the trolley frame when the trolley frame is in a folded configuration. 
     
     
       6. The foldable trolley mentioned in  claim 5 , wherein the back rollers are attached to a pair of plastic pieces, the plastic pieces being affixed to the back section of the lower frame, and wherein the back rollers can rotate around said plastic pieces 360°. 
     
     
       7. The foldable trolley mentioned in  claim 1 , wherein the lower frame is a closed rectangular frame and a grid layer is attached to the lower frame. 
     
     
       8. The foldable trolley mentioned in  claim 1 , wherein the back rollers are attached to a pair of plastic pieces, the plastic pieces being affixed to the back section of the lower frame, and wherein the back rollers can rotate 360° around said plastic pieces.